Form or mold for concrete.



J. K. GOIN. FORM OR MOLD FOR CONCRETE.

APPLICATION FILED OCT 3,1910.

Patented Jan. 30, 1912.

, ETSSHEET 1.

J. K. Gom- E'ORM 0R MOLD FOR CONCRETE.

APPLICATION FILED OUT-3, 1910.

1,01 6, 140. Patented Jan. 30, 1912 2 S EMSFSHEET 2.

' comprising a series of mold wall-sections- JOHN K. corn, or sr. LOUIS, msso'onr.

iiiitigldt).

I Specification of Letters ?atent.

some on MOLD For. concnnrn.

Patented in. so, 1912.

Application filed October 3, 1910. Serial No. 584,967.

all whom it may concern:

it known that I, JOHN K. Groin, a citizen of the United States, residing at Louis, Missouri, have invented a X1Wflfid-' useful Form or Mold for Concrete, of which the followin is a s ecification.

. his invention relates'to forms of molds for the formation of concrete structures, such as conduits, bridges and other hollow structures, and it has for its primaryobjoct to provide an adjustable form or mold and mechanism operable to adjust and hold said sections in any predetermined relation or adjustment.

Another object is to provide a form or mold compos d of a series ofwall-sections and a central operating shaft, in combination with the connections entraining'said sections with said shaft whereby rotation of said shaft will move saidfsections simultaneously and uniformly, and adevice for holding the parts adjusted in any adjustment in which they may be placed.

Another object is toprovide a form or mold for shaping interior surfaces of hollow objects formed of plastic material, which mold comprises a series of sections and operating mechanism for retracting or moving said sections effectively to collapse or reduce the mold so that it may readily be withdrawn after the plastic material has assumed proper shape and has become hardened or solidified.

There are other objects involving detailed construction and arrangment of the various parts embodied in the invention, all of which will be apparent to those skilled in the art to which this invention relates, without specific mention thereof.

In the accompanying drawings in which I have illustrated, a convenient and preferred form of my improved form of mold- Figure l is an end elevation of the form or mold. Fig. 2 is a longitudinal sectional view of a portion of the form or mold, illustrating the connections entraining the mold wall-sections with the central controlling and operating shaf Fig. 3 1s a cross sectional view on the line a-a of Fig. 2, showing the mold or form in its adjustment to the en training connections whereby the wall-sections are guided and held in proper position and relation to each other. Fig. 4c is a similarsectional view illustrating the mold in its reduced or collapsed adjustment for the formation of smaller structures, such as conduits, bridges, etc.

The wall of theform orinold comprises a series of metallic sections which may be of sufiicient length to form andcomplete the bridge or conduit. arcuate in cross section and near each end of each section a rack 2 is attached, .said racks constituting supports for the various wall sections. The racks 2 mesh with pinions 3 attached to the central operating shaft 4. There is one pinion for each pair of wall-sections, this arrangement being required since only two oppositel moving racks can be meshed with one pinion, which will be readily understood by reference to Fig. 3, in which two of said racks are shown entrained with a pinion; This requires the use of a number of pinionsnear each end of the form or mold, and said pinions'are separated from each other by disks 5. The racks 2 operate between the disks '5, which are secured together by bolts 6, a number of said bolts extending from end to end of the form or mold, thereby connecting the plates 5 at opposite ends of the mold and bracing them in proper relative adjustment. The racks 2 operate between the disks Sand are held from displacement by guidepieces 7 which will support theracks and thereby the wall-sections in proper relative adjustment. The inner end of each rack is provided with an elongated tooth or extension 8 which, by engagement with the pinion 3, will prevent further outward movement of the rack, which would result in disconnectionof the parts.

Said sections l are A crank or handle 9 is detachably connected to oneend of the shaft i and constitutes means for manual rotation of said shaft whereby the mold wall-sections may be operated. v

To hold the form or mold in its various adjustments and prevent compression or collapse thereof, I provide a ratchet wheel 10 which is secured to the shaft Land with. which a pawl ll'carried by the outer plate 5 engages. Said pawl and ratchet constitute a latch which will firmly hold the shaft against backward rotation until released. This will insure the form ormold remaining properly adjusted 'until the work of shaping theplastic material hasbeen completed.

-'While Ihave described the racks 2 asbeing connected to the ends of the wall-sections, I do not restrict myself to this arrangement, since it is obvious that there may be additional racks employed and connected to the wall-sections intermediate of the ends. Indeed this latter arrangement might be found desirable in forms or molds of more than 8 or 10 feet in length, since the racks constitute strengthening braces to support the wall-sections in proper position and to prevent their compression by the weight of the heavy plastic material. The particular embodiment shown is a form capable of adjustment from about 152 to 1 inches in diameter to about 28 to 30 inches in diameter and comprises six longitudinal wall sections, all of which are brought into use in the larger adjustments, and three of which are employed in the smaller adjustment. This arrangement has been found satisfactory in the form or mold of these dimensions, but may well. be varied to meet ditferent requirements, and I do not restrict my self to any specific number of wall sections.

In order to assist in determining the proper thickness of the walls, I provide auxiliary swinging sections 12 to the ends of which are connected rods 13, said rods 13 operate through collars 14 on the arms 15 which swing from the shaft 4:; set-screws 16 in the collars 14 are adjustable to bind the rods 13, so as to hold the auxiliary sections 12 at any desired distance away from the wall of the form or mold. These sections 12 may be moved to any desired at tment or may be removed entirely if de, ed. They Will be found useful however, in the formation of conduits constituting bridges, etc.

In using the device to form conduits,

bridges, etc., the bottom layer of the plastic material is first deposited and the form or mold is placed thereon in proper adjustment. The auxiliary sections 12 are properly adjusted and the spaces between said auxiliary sections and the wall of the form or mold are filled with the plastic material or concrete, which is allowed to solidify and harden. The auxiliary sections 12 are then raised above the hardened portion and the spaces thus formed are filled with the conorete or other plastic material used, which is also permitted to harden and solidify. This operation is repeated until the entire conduit or bridge is completed. After the plastic material has all become hardened, the latch or lock opposite the ratchet wheel 10 and the pawl 11 is released, and the shaft. 4 is rotated manually to retract or draw in wardly the mold wall-sectimis, thereby reducing the mold. or form so that it may readily be withdrawn from the interior of the conduit, bridge or the like.

I am aware that there may be various other arrangements and various modifications Within equivalent limits without departure from the nature and scope of my invention. I do not restrict myself to specific details, but

What I claim and desire to secure by Letters Patent is l. A form comprising a series of arcuate wall-sections, a shaft, a series of plates loosely mounted on said shaft, a binding device holding said plates in proper position, racks having their outer ends connected to said. wall-sections and extending between said plates, pinions mounted on said shaft between said plates in mesh with said racks, guides attached to said plates holding said racks in mesh with said pinions, means for operating said shaft effectively to reduce or enlarge said form, a latch device holding said shaft from backward rotation, arms swinging from said shaft, and auxiliary sections supported by said; arms, substantially as described.

2. A form or mold comprising a series of wall-sections, a shaft, pinions attached-to said shaft, plates loosely mounted on said shaft forming spaces in which said pinions are located, a binding device holding said plates in proper adjustment, racks in mesh with said pinions between said plates and having their outer ends attached to said wall-sections, a handle for turning said shaft, a latch device holding said shaft, arms pivoted upon said shaft, rods adjustably connected to said arms, and outer auxiliary sections connected to said rods whereby the thickness of the molded material may be determined, substantially as speci- 3. A form or mold comprising in com bination, a series of overlapping wall-sections, a shaft, pinions attached to said shaft, racks meshing with said pinions and having their outer ends connected to said wall-sections, respectively, elements separating said pinions and. holding said racks and'said pinions from lateral movement, guides supporting and holding said racks in mesh with said pinions, and means for rotating said shaft efi'cctively to form a complete mold wall composed of all or a less number of said wall sections, "substantially as specificd. I p

4. The combination with a series of overlapping wall-sections, and a shaft, of pinions attached to said shaft, racks meshing with said pinions and having their outer ends connected to said wall-sections, respectively, elements" holding said racks in mesh with said pinions, supporting guides between said elements for said racks, means for rotating said shaft efi'cctively to adjust all of said wall-sections in operative" adjustment as required to constitute complete hollow forms or molds of various sizes, or to adjust a less number of said wall-sections in the form of a complete hollow mold, and a latch device effective to hold said shaft and wall-sections in'their different adjustments aforesaid, substantially as specified. I

5. The combination with a series of overlapping wallsections, and a shaft, of pinions attached to said shaft, racks meshing with said pinions and having their outer ends rigidly connected to saidwall-sections,

respectively, elements holding said racks and said pinions from lateral movement, supporting guides holding saidracks in mesh with said pinions, means for rotating said shaft effectively to adjustall one. less number of 'said wall-sections in operative adjustment as required to constitutewalls for complete hollow molds of various sizes from a relatively justments, arms swinging. from 'sa'idshaft, and auxiliary sectionssupported said arms, substantially as specified;

6. A form or mold comprisinga series of wall-sections, a shaft, pinions attached to said shaft, plates-loosely mounted onsaid,

which said;

shaft and forming spaces in pinions are located, racks in mesh with-saidpinions between said plates andhaving their outer ends" attached to said wall-sections, guides for said raclts' 'attachedto said plates, a handle for turmng said shaft, and 'a-latch device holding said substan tially as specified.

Z. A form or mold c mprising' aseriesof wall-sections, a shaftypinions' f attached to said shaft, plates loosely-mounted on'igsaid shaft and forming spaces in which said pinions are located, binding devices holding {said plates in proper adjustment, racks in wall-sec tens, guides to said plates, a handle for turning saidmesh with said pinions between said plates and barging their outer ends attached to said for said racks attached shaft,.'arms pivoted upon said shaft, and

auxiliary sections connected to said arms,

'substantially as specified.

8. A form or mold comprising a series of wallisections, a shaft, pinions attached to said shafh plates. loosely mounted-on said shaft and forming spaces in which said pin" ionsare located, means holding said plates in proper adjustment, guides attached to ,said plates, racks extending between said "plates and between said guides 111 mesh small moldto'a relatively large mold, a latch device effective to' hold said} as specified. shaft and wall-sections in their different ad- 10. In a mold the combination with a cenw alhsections,

specified.

with said pinions and having their outer ends attached to said wall-sections, a handle for turning'said shaft, and auxiliary sect-ions connected to said shaft whereby the thickness .of the molded material may be determined, substantially as specified.

9. In a mold, the. combination with a central shaft, and overlappingwall-sections, of racks entraining said overlapping wall-sections with said shaft, disks preventing lateral' movement of said racks, supporting guides between said disks for said racks,

and means for operating said shaft'eifectively to withdraw a. number of said sectionsv from the surface of the form or mold and form a complete annular mold with the remainder of said sections, substantially tral shaft, and overlapping sheet metal wallsections, of racks entrained with said shaft and. having their outer ends connected to said wall-sections, plates preventing lateral movement of said racks, guides-for said racks between said to withdraw a. number of saidsections from the surface of the form or mold and form a complete annular mold with the remainder:

f said sections, substantially as specified. 1. In a mold, the combination with a to said wall sections, a plate on each side of said racks, guides attached to said plates plates, and means for op 'erating said shaft and said racks effectively tral'shaft, and overlapping sheet metal H of racks entrained with'sald I shaft and havingtheir outer' ends .connected holding said racks from lateral v movement,

means for operating said shaft effectively to withdraw/a number ofsaid sections from the surfatze of the form or mold and form a compl'eterelatiyely much smaller annular mold with the remainder of saidsections, and auxiiiary'forms connected to said shaft whereby the thickness of the molded maof two sub- 

